[Bug]: Sea ice (SImon) variables report missing values instead of zeros over open ocean region.

[chengzhuzhang]

What happened?

CMIP data users reported that in E3SM v2 data reported to CMIP, Sea ice (SImon) variables put missing values instead of zeros over open ocean region.

What did you expect to happen? Are there are possible answers you came across?

Solution With @czender's update in ncremap, " The ncremap command will recover the v1 default behavior where the default sea-ice regridding puts zeros (rather than masks) the open-ocean region (left-hand panel). Calling ncremap --mpt_mss ("empty regions are missing values") causes the regridder to mask the open ocean regions of sea-ice data (as in our v2 published data) ". ncremap --mpt_mss will need to apply to specific variables such as temperature, and sea ice velocities.

Minimal Complete Verifiable Example (MVCE)

e3sm_to_cmip -s --realm SImon --var-list siconc, sitemptop, sisnmass, sitimefrac, siu, siv, sithick, sisnthick, simass --map ${e2c_path}/maps/map_EC30to60E2r2_to_cmip6_180x360_aave.20220301.nc --input-path ${model_data}/v2.mpassi_input/ --output-path ${result_dir} --user-metadata ${metadata_path}  --tables-path ${e2c_path}/cmor/cmip6-cmor-tables/Tables

Relevant log output

No response

Anything else we need to know?

No response

Environment

Expect using NCO>5.1.8 will change this behavior